import java.util.*;

public class Solution {

    public boolean isUgly(int n) {
        if (n < 1) return false;
        while (n % 2 == 0) n /= 2;
        while (n % 3 == 0) n /= 3;
        while (n % 5 == 0) n /= 5;
        return n == 1;
    }

}

